Tinea cruris is caused by a fungal infection and its occurrence is generally localized, usually appearing on the upper thigh or buttocks. Eczema, on the other hand, is mainly caused by allergies and can occur in varying locations, possibly on the upper thigh or external genitals, and can even spread across the entire body. The treatments for these two diseases differ; tinea cruris can generally be cured with antifungal creams, whereas the treatment for eczema involves a combination of medications including oral antiallergic drugs and the topical application of steroid creams. Both conditions are relatively treatable, but if they persist for a long time, continuous effort and the adoption of good dietary and lifestyle habits are necessary. Avoid public baths and swimming pools and try to abstain from spicy and irritating foods.